The staff at Mandel & Associates Ltd. possess extensive experience within the field of vocational and rehabilitation psychology where the primary focus is disability assessment and/or return to the workforce. Our psychologists bring forth expertise in the areas of chronic pain, head injury, substance abuse, career consulting and development, psychiatric issues, recovery from sexual abuse, post-concussion syndrome, stress and pain management, and adjustment to disability.

We provide vocational, psychological, psychiatric, neuropsychological,  psychoeducational, chronic pain/disability, assistive technology, work site, cognitive, gifted and talented education, and functional capacity assessments, as well as counselling services for rehabilitation. Our Registered Psychologists have been accepted on many occasions as expert witnesses in psychological and vocational assessment in the Court of Queen's Bench of Alberta.


Dr. MandelDr. Allan Mandel
Dr. Allan Mandel, Ph.D., R. Psych., has been President of Mandel & Associates since its inception in 1997. He is a registered psychologist with more than 28 years of clinical and management experience, particularly within the fields of rehabilitation psychology and psychological assessment. He is a highly sought-after expert witness by both defense and plaintiff lawyers, mainly in the area of vocational assessment.

He has provided expert vocational assessments for the Court of Queen's Bench in Alberta since 1990, and since 1997 he has conducted and overseen assessments provided by Mandel & Associates for Alberta Health Services and for the Assured Income for the Severely Handicapped program (Alberta Seniors and Community Supports). As a reflection of his reputation within the legal community, he was asked to provide expert testimony within a recent constitutional challenge related to insurance regulations in the province of Alberta.

In addition to his role as President of Mandel & Associates, Dr. Mandel is an Adjunct Associate Professor in the Psychology Department at the University of Calgary, where his primary role involves teaching psychological assessment techniques to graduate students.

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Dr. John Berendt
Dr. John Berendt, Ph.D., R. Psych., possesses over 19 years experience specializing in chronic pain rehabilitation and over 26 years experience in counseling and vocational assessment. He has worked in a variety of settings and roles, including adult education instructor, vocational counselor, mental health counselor, staff psychologist at a pain clinic, and assessment expert within a private practice. Much of his work experience has been within the area of vocational and rehabilitation psychology (e.g., with WCB and AISH clients), and he has conducted thousands of vocational and psychological assessments. He has been accepted as an expert in psychological and vocational assessment by the Court of Queen's Bench of Alberta.

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Dr. Gregor Jason
Dr.Gregor Jason, D. Phil., R. Psych., studied neuropsychology at Oxford University and the Montreal Neurological Institute and registered as a psychologist in 1983. He specializes in assessing brain function, including memory, language, attention, spatial relations, problem solving, and other abilities. In additional to neuropsychological evaluations, he conducts combined neuropsychological and vocational evaluations which are designed to provide detailed analyses of vocational potential, integrating occupational experience, interests, and abilities.

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Dr. Michael Boissevain
Dr. Michael Boissevain, Ph.D., R. Psych., obtained his Honours BA in Psychology at University of Victoria and his Ph.D. at the University of Western Ontario. He was employed as the clinical director of a multidisciplinary pain program for 9 years. Since 2007 he has been the psychologist to the Vancouver Island Health Authority Regional Pain Program in Victoria. As well as being a senior associate at Mandel and Associates since 2000 he has had a private practice for 16 years in Victoria specializing in rehabilitation psychology, psychological assessment, and vocational assessment. Dr. Boissevain has published and made presentations in the areas of chronic pain, psychological assessment and treatment, and vocational rehabilitation. Registered in BC and Alberta, he is recognized as an expert in clinical psychology, psychological assessment, vocational assessment, and chronic pain by the courts in BC and Alberta.

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Dr. Victor Grossi - In Memoriam
Dr. Vic Grossi was an associate at Mandel & Associates for more than 20 years, during which time we had the pleasure to be in the company of his kind and gentle nature. He was a caring and compassionate individual, and an outstanding therapist and humanist. After his untimely and sudden death in October 2015, there was a huge outpouring of wishes from colleagues and clients alike, testifying to his warmth and friendliness and to the positive impact he had on people. He has left a void but his spirit remains with us, serving as an example that we can only hope to emulate.

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Mara Biasotto
Mara Biasotto, M.Sc. (Registered Psychologist), has worked in the field of rehabilitation since 1993. She has gained considerable experience working with clients with a variety of disabilities. For the past several years she has also worked with individuals with developmental disabilities. She has conducted numerous psychological/disability and vocational assessments, as well as learning disability and attention deficit/hyperactivity disorder assessments.

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Catherine Paterson
Catherine Paterson, M.A. (Registered Psychologist),  is originally from Edmonton. She administered her first psychological test in 1987, and completed coursework and clinical training in the PhD program at York University. She has worked in private, hospital, and educational settings, specializing in the assessment of individuals with intellectual, emotional, and neurological disorders. She has training in projective tests, behavioural interventions, and bereavement counselling. Ms. Paterson has been a consultant with Mandel and Associates since 2000. She enjoys helping clients explore their psychological strengths and weaknesses and providing recommendations for support. She currently resides in Central Alberta with her husband and three children.

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Colleen Linney
Colleen Linney, M.Ed. (Registered Psychologist), has been practicing as a registered psychologist in Alberta since 1998. In her work as a rehabilitation psychologist, she has been employed in community-based rehabilitation services specializing in vocational rehabilitation of people with acquired brain injury. Her career has also focused on assessment of adults with severe disability for evaluation of appropriateness in relation to their work and/or educational potential to assist with treatment planning, medical legal processes, or appropriateness for funding or programs. Ms. Linney has been employed with Mandel and Associates since 2003.

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Dr. Deborah Dobson

Dr. Deborah Dobson, Ph.D., is a psychologist who has worked in both the public and private health systems in Calgary.  She is an Adjunct Professor in the Department of Psychology at the University of Calgary.  She was the Director of Clinical Training for the Calgary Clinical Psychology Residency from 2008 to 2013.  Dr. Dobson has served on the Board of the Canadian Mental Health Association - Calgary Region, including as its’ President and was the Chair of the Clinical Section for the Canadian Psychological Association from 2007 to 2008.  She is a Founding Member of the Canadian Association of Cognitive-Behavioural Therapies and has served on its’ Board in several different capacities. She is a Diplomate with the Academy of Cognitive Therapy and has certification in cognitive behavioural therapy. Her professional interests include client access to empirically supported treatments, clinical training, consumer advocacy, and cognitive-behavioral therapies for anxiety and depression.

Further to provision of assessments, Dr. Dobson also maintains a private practice at Mandel and Associates, where she provides cognitive-behavioral therapy for adult clients with mental health problems.  For additional service and contact information specific to her private practice, we refer you to

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Dr. Donna Stephen
Dr. Donna Stephen, Ph.D., R. Psych., was mentored into a career in clinical psychology by the eminent suicidologist, Dr. Edwin S. Shneidman. Her internship at Didi Hirsch Community Mental Health Center in Culver City, California, emphasized crisis intervention, adult psychotherapy and gerontology. She then pursued a post doctoral fellowship in behavioural medicine [health psychology] at Kaiser Permanente Medical Centre, Hollywood, with Dr. Cynthia D. Belar. She spent two years at Barrington Psychiatric Centre, West Lost Angeles, conducting medical/legal [personal injury] evaluations, while pursuing a private practise in Santa Monica. She then designed, implemented and directed a chronic pain program at Western Occupational Rehabilitation Centre and a postconcussion syndrome program at Brain Injury Rehabilitation Centre - both in Calgary. Currently Dr. Stephen is engaged in the independent practice of clinical and health psychology with offices in Banff and on the Wesley First Nation in Morley. She has been affiliated with Mandel and Associates since 2002 where she specialises in health/medical, psychiatric and vocational assessments.

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Dr. Sharon Pham
Dr. Sharon Pham, Ph.D., is a psychologist with Alberta Health Services (AHS) Calgary Zone.  She currently practices at the Chronic Pain Centre, where she works closely with an interdisciplinary team of physicians, physiotherapists, and other healthcare professionals in the treatment of individuals with a variety of chronic pain disorders, particularly chronic daily headaches.  Dr. Pham is a member of the AHS (Calgary Zone) Psychology Professional Practice Committee, representing over 100 psychologists employed in the Calgary Zone.  For the past 5 years, Dr. Pham is an assistant professor of counseling psychology at Providence Theological Seminary.  In the past, she has been a board member of the Pain Society of Alberta.  Her professional interests include psychological therapies for chronic pain, the role of spirituality in pain coping, the association between post-traumatic stress and chronic pain, and the integration of psychology and theology.

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Richard Alarie
Richard Alarie, M.A., R. Psych., is a psychologist who has worked with Alberta Health Services and in private practice for the past 18 years. Much of his clinical work experience is in the area of specialized mental health assessment and intervention in community clinic settings. He has worked in the field of adult and geriatric mental health in a variety of roles, including as a therapist, supervisor, and manager. An area of interest is the development of innovative community-based interventions to treat complex mental health populations, such as Assertive Community Treatment and Community Extension Team.

Mr. Alarie has significant experience in conducting psychological assessment in the areas of mental health and cognitive functioning. He works at Mandel & Associates providing psychological/disability assessments for government organizations such as Alberta Assured Income for Severely Handicapped, as well as independent psychological and vocational examinations. In addition to providing psychological assessments, Mr. Alarie maintains a private practice at Mandel & Associates where he provides cognitive-behavioural therapy to adults with a range of mental health problems, including depression, anxiety, bipolar and psychotic disorders.

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Dr. Mary Westcott
Dr. Mary Westcott, Ph.D., is a registered psychologist who has provided assessment and treatment services to adults living with attention deficit hyperactivity disorder, learning disability, autism spectrum disorder, acquired brain injury, physical disability, chronic pain, complex medical conditions, and a range of mental health challenges. She joined Mandel and Associates in 2009 where she conducts psychoeducational, psychological, vocational, cognitive, and disability assessments for government organizations and private practice clients. She is expert in learning and psychoeducational evaluations which analyze people's ability to pursue post-secondary education, and identify any accommodations which may be necessary to maximize their potential for success. Dr. Westcott combines history, assessment data, and observation within the context of each client's unique life experiences, abilities, and goals to formulate meaningful recommendations. In addition to her assessment work, Dr. Westcott counsels individuals who are adjusting to the emotional and physical aftermath of motor vehicle accidents, workplace-related accidents, and other types of trauma or disabling conditions.

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Neil Hehr


Neil Hehr has been working with technology and persons with disabilities for over 21 years, and has been conducting Information Technology and Assistive Technology assessments at Mandel & Associates for over 3 years. Neil also provides technological support at Calgary Quest School as an Information / Assistive Technologist.  For 5 years, he worked on a federally funded project called IT for Inclusion through the Developmental Disability Resource Centre of Calgary, which also involved working with people with disabilities in Calgary and performing assistive technology assessments. He received an Electronic Engineering Diploma in 1992, owned his own computer store for several years, as well as built computers and provided IT support for many agencies over the last 20 years. 


Dr. Sally MacLean 

Dr. Sally MacLean (B.S.W., M.Ed., M.Sc., Ph.D.) is a rehabilitation psychologist with Alberta Health Services, currently working as part of an interprofessional team on the Amputee, Orthopedic and Burn Treatment Units at the Glenrose Rehabilitation Hospital in Edmonton Alberta. She has a Ph.D. from the Graduate Division of Educational Research with a specialization in Rehabilitation and Disability Studies from the University of Calgary. She also holds a Bachelor’s degree in Social Work, a Master of Education degree in Adult, Community and Higher Education and a Master of Science degree in Counseling Psychology.

Dr. MacLean has advanced training in the assessment and treatment of post traumatic stress disorder, and expertise facilitating psychological adjustment to disability, chronic pain, and physical trauma. She began her career as a clinical social worker, and for many years was involved in vocational and life role counseling, and career decision-making.  She also has a strong background in program development and evaluation, and contracts/project management as a result of her involvement with the Government of Alberta’s Works, AISH and PDD programs.  

Dr. MacLean’s clinical work focuses on those physically and psychologically impacted by illness, injury, or traumatic exposure, often via their roles in human services, or within the various levels of the health care system.  She also works with military servicemen/women, first responders, and Workers Compensation Board (WCB) claimants.  
Her research interests focus on technological advancements which enhance the field of mental health rehabilitation, and which promote ongoing psychological resiliency and wellness. She is currently exploring psychosocial applications of a Computer Assisted Rehabilitation Environment (CAREN) for mental health research.  She maintains active registration with the College of Alberta Psychologists, the Psychological Association of Alberta, and the International Society for Traumatic Stress Studies.


Dr. Christine Knight 

In addition to conducting assessments at Mandel and Associates, Dr. Knight is a psychologist with Geriatric Mental Health - Alberta Health Services, where she provides assessment, diagnostic and treatment services to older adults presenting with complex psychiatric and medical co-morbidities, including physical disability, chronic pain, post-traumatic stress disorder and suspected cognitive impairment or dementia. She has extensive experience acting as a regional resource, working in partnership with, and providing consultation to clients, families, and physicians and to professional and para-professional staff along the continuum of health care, including outreach, day treatment, inpatient psychiatric units, medical and rehabilitation units, supported housing and long-term care. She received her B.A. in Psychology from McGill University, a joint M.Sc. in Applied Psychology and Gerontology from the University of Waterloo and a Ph.D. in Clinical Psychology from Lakehead University. Dr. Knight also conducts research and program evaluation, and as well teaches and provides clinical supervision to graduate students in the Department of Psychology at the University of Calgary. She maintains active registration with the College of Alberta Psychologists, and is a member of the Canadian Psychological Association and the National Academy of Neuropsychology.



Dr. Michelle DeLisle 

Dr. Michelle DeLisle obtained her doctoral degree from Queen’s University, Kingston Ontario in 2008 and began working as a clinical psychologist with Alberta Health Services (Calgary Zone) in 2009. Since then she has performed pain assessments, offered groups based on cognitive-behavioral therapy for insomnia and chronic pain, and provided individual therapy to adults with chronic pain in the neuromusculoskeletal and headache pain programs at the Calgary Chronic Pain Centre. She also enjoys teaching, and for the past two years, she has delivered inter-professional pain lectures to medical students at the University of Calgary along with her colleagues in the fields of medicine, physical therapy, pharmacy, and social work. Additionally, she has strong research interests and has co-authored nine research articles and two book chapters in a wide range of topics, including leisure motivation, anger management, depression, and suicide risk. She previously served on the planning committee of the Pain Society of Alberta and is currently a member of the Canadian Psychological Association, the Psychologists’ Association of Alberta, and the Pain Society of Alberta.



Dr. Michael Zwiers 

Dr. Michael Lee Zwiers is a registered psychologist who practices in the areas of Clinical, Counselling, and School Psychology. He is an adjunct assistant professor in the Werklund School of Education. Dr. Zwiers holds a Master’s degree in Educational Psychology and a Ph.D. in Counselling Psychology, with two years of post-doctoral training in Clinical Psychology. Dr. Zwiers specializes in the assessment and treatment of mental health disorders and learning disabilities across the lifespan and has a special interest in clinical diagnosis. His work has included the education of practicing professionals and graduate students, with a focus on psychological and psychoeducational assessment.



Meghan Mak 

Ms. Mak, M.A., is a registered psychologist who has comprehensive knowledge and formal training in the assessment of developmental, learning, cognitive, attention, emotional, and behavioural concerns. She has worked with post-secondary students throughout the majority of her career, and has an in-depth understanding of barriers facing individuals who are transitioning into or currently pursuing post-secondary studies. Ms. Mak has extensive experience in developing accommodation plans, exploring funding options, problem-solving accommodation-related concerns, and increasing students' capacity for self-advocacy. In the past, she conducted psycho-educational assessments for the Calgary Board of Education and the Children's Hospital of Eastern Ontario Preschool Autism Program. She has published and presented on a variety of topics that include assessment of written language in post-secondary students and attention deficit hyperactivity disorder. She joined Mandel and Associates in 2018.



Dr. Pieter van den Berg 

Dr. Pieter van den Berg is a registrant of the College of Alberta Psychologists, the College of Vocational Rehabilitation Professionals, and the Vocational Rehabilitation Association of Canada. He is also a member of the Canadian Psychological Association, the Canadian Society of Medical Evaluators, the American Board of Vocational Experts, and the Canadian Pain Society. Dr. van den Berg graduated with a Master of Arts degree in Industrial Psychology from the University of Stellenbosch in 1996. He completed a Doctor of Psychology degree (Psy.D.) in Clinical Psychology from California Southern University in 2017. His research focused on the impact and determinants of back pain on job performance with regard to productivity and absenteeism. His work history aligns with his educational background and has focused on psychology and vocational rehabilitation.